Aspect ratio vs cubic centimeters

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Aspect ratio vs cubic centimeters

Postby cougar » Mon Oct 16, 2017 8:52 am

In looking for a suitable towing turbo for my 92, I ran into differing nomenclature for exhaust housings. I'm use to Holsets use of "cm"'s and have a good idea on sizing, but how does aspect ratio translate? I'm currently running an H1C with a non waste-gated 16cm and a GDS 60mm turbine side. Not enough air to clean up enough my 7X.010 injectors. Not looking for turbo recommendations, just a comparison between cm and ar.

Thanks
RIP 91.5 W250 5 speed. The great experiment.
92 W250 HD 47RH with Compushift. Upgraded H1C to 60/60/16, modified fuel pin, and DAP 7X.010 injectors.
01 2500 "the work truck".
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Re: Aspect ratio vs cubic centimeters

Postby PToombs » Mon Oct 16, 2017 4:02 pm

I'm used to Holsets version too and am lost on ratio. I got away from the 16 and now have a 12 wastegated with the HTT 60mm Stage 4 kit I put on when I installed it on the compounds. I started with a 62-71/14, then swapped that out for the hybrid. I know it spools way the heck faster than it did before.
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Re: Aspect ratio vs cubic centimeters

Postby ellis93 » Wed Oct 18, 2017 4:21 am

You could probably swap that housing out for a 12 or 14cm so it spools a little faster and drives a little harder. I have had the same setup.....actually honed 7x10s (bigger) and the hybrid cleaned them right up.

There may be an air leak.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: Aspect ratio vs cubic centimeters

Postby cougar » Wed Oct 18, 2017 8:44 am

The HTT turbo I use to have with those injectors I think was about that size except the turbine housing was a 13. It worked pretty well on the 91.5, but it could get a little warm but controllable without having to slow way down. It was probably because of the 3.07 gears in that truck. There is a 62MM HX40 hybrid with a larger turbine wheel on ebay i'm considering, but is has an .82 exhaust housing. I don't know what that translates into, bigger than or smaller than. Another option was upping my current H1C to a 62mm compressor and a 14cm gated exhaust housing. I was thinking upping an HX35, but they are not cheap up here and hard to come by. I've pretty much ruled out the HE351 because of it's tiny 9cm exhaust side unless I can get a VGT and put a controller on it. And good luck finding one up here. I'm pretty sure I don't have any air leaks. I'm pushing a little over 30psi and not have much of an issue with high EGT.
RIP 91.5 W250 5 speed. The great experiment.
92 W250 HD 47RH with Compushift. Upgraded H1C to 60/60/16, modified fuel pin, and DAP 7X.010 injectors.
01 2500 "the work truck".
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Re: Aspect ratio vs cubic centimeters

Postby Remps » Wed Oct 18, 2017 7:14 pm

From what I've read on the internet forums over the years a .7 = 12 cm, .8 = 14 cm, and a .91 is 16-17 cm. Although I THINK the t4 sizing has to be taken into account on the .91 t4. I think I searched around for the same thing a few years ago (a conversion or chart or something) and never found anything concrete.
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
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Re: Aspect ratio vs cubic centimeters

Postby cougar » Thu Oct 19, 2017 12:53 pm

Remps wrote:From what I've read on the internet forums over the years a .7 = 12 cm, .8 = 14 cm, and a .91 is 16-17 cm. Although I THINK the t4 sizing has to be taken into account on the .91 t4. I think I searched around for the same thing a few years ago (a conversion or chart or something) and never found anything concrete.
thank you! I’m a little more hesitant about that HX40 hybrid now. Being a T3, non waste gated, 3” outlet i’d worry about exhaust temperatures climbing on a hill with a good load.
RIP 91.5 W250 5 speed. The great experiment.
92 W250 HD 47RH with Compushift. Upgraded H1C to 60/60/16, modified fuel pin, and DAP 7X.010 injectors.
01 2500 "the work truck".
cougar
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Re: Aspect ratio vs cubic centimeters

Postby Remps » Thu Oct 19, 2017 10:18 pm

I'd be worried about possible surging issues making your h1c a 62/60/14 in the lower rpms. I remember a fellow on CF had some minor surging issues with that size turbo a while back, I think he added some timing and it stopped iirc. One could most likely drive/tune your way around it, and/or stay with the 16 cm turbine housing.
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
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Re: Aspect ratio vs cubic centimeters

Postby cougar » Wed Nov 01, 2017 8:51 am

Would there be any advantage to increasing the turbine wheel size and/or blade count along with the 62mm compressor wheel? Looks like I can get a 64mm turbine wheel from BAE. So I would wind up with something like 62/64/16 for less than $500.
RIP 91.5 W250 5 speed. The great experiment.
92 W250 HD 47RH with Compushift. Upgraded H1C to 60/60/16, modified fuel pin, and DAP 7X.010 injectors.
01 2500 "the work truck".
cougar
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Re: Aspect ratio vs cubic centimeters

Postby Remps » Thu Nov 02, 2017 11:35 pm

I highly doubt you'd have surging issues with a 64 turbine wheel, although I'd want a 12 or 14 cm wastegated housing for better spool. If you're only making 30 psi and not planning on adding more fuel I'd go 12 cm housing, and set the gate around 35-37 psi.
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
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Re: Aspect ratio vs cubic centimeters

Postby ellis93 » Fri Nov 03, 2017 3:48 am

cougar wrote:Would there be any advantage to increasing the turbine wheel size and/or blade count along with the 62mm compressor wheel? Looks like I can get a 64mm turbine wheel from BAE. So I would wind up with something like 62/64/16 for less than $500.

Don't waste your time with BAE. I made an order,paid for it,and never recieved it. About 4 months ago. Complete waste of time.
I have since bought a unit off of eBay,a 62/64 16, and another (used) off of an individual. The plan is to open up a 12cm housing and use it in place of the 16 on the eBay unit and compair it to the used unit,on the 24v Chevy.
The eBay unit is one of those China knock off turbos and I'm going to beat the living hell out of it just to see if it'll live. I doubt I'll have issues since I don't have the fuel that others have.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: Aspect ratio vs cubic centimeters

Postby cougar » Fri Nov 03, 2017 9:12 am

Guess I'll have to wait until I win the lottery.
RIP 91.5 W250 5 speed. The great experiment.
92 W250 HD 47RH with Compushift. Upgraded H1C to 60/60/16, modified fuel pin, and DAP 7X.010 injectors.
01 2500 "the work truck".
cougar
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Re: Aspect ratio vs cubic centimeters

Postby ellis93 » Sat Nov 04, 2017 4:28 pm

cougar wrote:Guess I'll have to wait until I win the lottery.

Hold up! Seeing as you said this,I milled out my 12cm housing off my wh1c and installed it on the eBay JM turbo......Chinese turbo,62/65/16 when purchased. I'll tell you shortly how it holds up. I installed it today and have put 40miles on it since after lunch. Give it time......it'll either blow up or live in the next few weeks. I'm going to whip on it.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: Aspect ratio vs cubic centimeters

Postby Remps » Sat Nov 04, 2017 10:08 pm

Which truck you put it on Ellis?
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
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Re: Aspect ratio vs cubic centimeters

Postby ellis93 » Sun Nov 05, 2017 8:58 am

Remps wrote:Which truck you put it on Ellis?

The 1/2 ton Chevy with the 24valve
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: Aspect ratio vs cubic centimeters

Postby ellis93 » Tue Nov 07, 2017 7:11 am

@Cougar
Day3.....So far I'm not regretting the purchase or the machining of my 12cm exhaust housing. Over 200 miles and it sounds like a jet creeping down main street with the windows down. Spool time with this automatic trans is almost nothing,you can goose the throttle in neutral and get 4/5# easy.
The whole reason I'm fooling with this china brand turbo is because of all the hate they seem to get on the internet.....may of which are ancient.
We'll see....one way or another.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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